<template>
  <view>
    <!-- 搜索组件 -->
    <my-search @click="goSearch"></my-search>
    <!-- 列表容器 -->
    <view class="scroll-view-container">
      <!-- 左侧一级列表 -->
      <scroll-view scroll-y="true" class="left-scroll-view" :style="{height: wh + 'px'}">
        <block v-for="(item, index) in cateList" :key="index">
          <view @click="activeChanged(index)" :class="['left-scroll-view-item', index == active ?'active':'']">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧二级列表 -->
      <scroll-view scroll-y="true" class="right-scroll-view" :style="{height: wh+'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, index) in cateLevel2" :key="index">
          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
          <!-- 三级列表数据 -->
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3, i) in item2.children" :key="i" @click="goGoodsList(item3)">
              <image :src="item3.cat_icon" mode=""></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix  from '@/mixins/tabbar_badge.js'
  export default {
    mixins: [badgeMix],
    data() {
      return {
        wh: 0, // 屏幕高度、
        cateList: [] ,// 商品列表(一级)
        active: 0, // 激活的索引
        cateLevel2: [], // 二级商品数据
        scrollTop: 0, // 二级列表置顶
      }
    },
    onLoad() {
      // 获取屏幕高度
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods: {
      // 获取商品数据
      async getCateList() {
        // 发起网络请求
        const { data: res } = await uni.$http.get('/categories')
        // 判断
        if (res.meta.status !== 200) return uni.$showMsg()
        // 成功赋值
        this.cateList = res.message
        this.cateLevel2 = res.message[0].children
      },
      // 激活的索引
      activeChanged(idx) {
        // 切换激活
        this.active = idx
        // 二级列表
        this.cateLevel2 = this.cateList[idx].children
        // 切换置顶
        this.scrollTop = this.scrollTop===0 ? 1 : 0
      },
      // 点击商品跳转页面
      goGoodsList(val) {
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid=' + val.cat_id
        })
      },
      goSearch() {
        console.log('ok')
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;

    .left-scroll-view {
      width: 120px;
      .left-scroll-view-item {
        line-height: 60px;
        text-align: center;
        background-color: #F7F7F7;
        font-size: 12px;
        &.active{
          background-color: #FFFFFF;
          position: relative;
          &::before {
            content: '';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #C00000;
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
          }
        }
      }
    }
  }
  .cate-lv2{
    .cate-lv2-title{
      text-align: center;
      font-size: 12px;
      font-weight: bold;
      padding: 15px 0;
    }
    .cate-lv3-list {
      display: flex;
      flex-wrap: wrap;
      .cate-lv3-item{
        width: 33.33%;
        margin-bottom: 10px;
        display: flex;
        flex-direction: column;
        align-items: center;
        image {
          width: 60px;
          height: 60px;
        }
        text {
          font-size: 12px;
        }
      }
    }
  }
</style>
